This patch includes the serial driver for s5pc1xx. s5pc1xx uart driver needs own register setting and clock configuration. So, need to special driver. Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>master
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/*
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* (C) Copyright 2009 SAMSUNG Electronics |
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* Minkyu Kang <mk7.kang@samsung.com> |
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* Heungjun Kim <riverful.kim@samsung.com> |
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* |
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* based on drivers/serial/s3c64xx.c |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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*/ |
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#include <common.h> |
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#include <asm/io.h> |
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#include <asm/arch/uart.h> |
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#include <asm/arch/clk.h> |
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#include <serial.h> |
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static inline struct s5pc1xx_uart *s5pc1xx_get_base_uart(int dev_index) |
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{ |
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u32 offset = dev_index * sizeof(struct s5pc1xx_uart); |
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if (cpu_is_s5pc100()) |
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return (struct s5pc1xx_uart *)(S5PC100_UART_BASE + offset); |
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else |
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return (struct s5pc1xx_uart *)(S5PC110_UART_BASE + offset); |
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} |
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/*
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* The coefficient, used to calculate the baudrate on S5PC1XX UARTs is |
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* calculated as |
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* C = UBRDIV * 16 + number_of_set_bits_in_UDIVSLOT |
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* however, section 31.6.11 of the datasheet doesn't recomment using 1 for 1, |
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* 3 for 2, ... (2^n - 1) for n, instead, they suggest using these constants: |
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*/ |
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static const int udivslot[] = { |
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0, |
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0x0080, |
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0x0808, |
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0x0888, |
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0x2222, |
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0x4924, |
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0x4a52, |
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0x54aa, |
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0x5555, |
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0xd555, |
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0xd5d5, |
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0xddd5, |
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0xdddd, |
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0xdfdd, |
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0xdfdf, |
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0xffdf, |
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}; |
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void serial_setbrg_dev(const int dev_index) |
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{ |
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DECLARE_GLOBAL_DATA_PTR; |
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); |
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u32 pclk = get_pclk(); |
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u32 baudrate = gd->baudrate; |
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u32 val; |
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val = pclk / baudrate; |
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writel(val / 16 - 1, &uart->ubrdiv); |
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writel(udivslot[val % 16], &uart->udivslot); |
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} |
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/*
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* Initialise the serial port with the given baudrate. The settings |
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* are always 8 data bits, no parity, 1 stop bit, no start bits. |
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*/ |
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int serial_init_dev(const int dev_index) |
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{ |
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); |
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/* reset and enable FIFOs, set triggers to the maximum */ |
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writel(0, &uart->ufcon); |
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writel(0, &uart->umcon); |
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/* 8N1 */ |
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writel(0x3, &uart->ulcon); |
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/* No interrupts, no DMA, pure polling */ |
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writel(0x245, &uart->ucon); |
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serial_setbrg_dev(dev_index); |
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return 0; |
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} |
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static int serial_err_check(const int dev_index) |
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{ |
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); |
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if (readl(&uart->uerstat) & 0xf) |
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return 1; |
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return 0; |
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} |
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0 |
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* otherwise. When the function is succesfull, the character read is |
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* written into its argument c. |
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*/ |
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int serial_getc_dev(const int dev_index) |
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{ |
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); |
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/* wait for character to arrive */ |
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while (!(readl(&uart->utrstat) & 0x1)) { |
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if (serial_err_check(dev_index)) |
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return 0; |
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} |
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return (int)(readl(&uart->urxh) & 0xff); |
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} |
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/*
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* Output a single byte to the serial port. |
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*/ |
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void serial_putc_dev(const char c, const int dev_index) |
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{ |
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); |
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/* wait for room in the tx FIFO */ |
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while (!(readl(&uart->utrstat) & 0x2)) { |
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if (serial_err_check(dev_index)) |
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return; |
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} |
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writel(c, &uart->utxh); |
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/* If \n, also do \r */ |
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if (c == '\n') |
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serial_putc('\r'); |
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} |
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/*
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* Test whether a character is in the RX buffer |
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*/ |
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int serial_tstc_dev(const int dev_index) |
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{ |
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struct s5pc1xx_uart *const uart = s5pc1xx_get_base_uart(dev_index); |
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return (int)(readl(&uart->utrstat) & 0x1); |
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} |
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void serial_puts_dev(const char *s, const int dev_index) |
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{ |
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while (*s) |
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serial_putc_dev(*s++, dev_index); |
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} |
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/* Multi serial device functions */ |
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#define DECLARE_S5P_SERIAL_FUNCTIONS(port) \ |
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int s5p_serial##port##_init(void) { return serial_init_dev(port); } \
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void s5p_serial##port##_setbrg(void) { serial_setbrg_dev(port); } \
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int s5p_serial##port##_getc(void) { return serial_getc_dev(port); } \
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int s5p_serial##port##_tstc(void) { return serial_tstc_dev(port); } \
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void s5p_serial##port##_putc(const char c) { serial_putc_dev(c, port); } \
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void s5p_serial##port##_puts(const char *s) { serial_puts_dev(s, port); } |
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#define INIT_S5P_SERIAL_STRUCTURE(port, name, bus) { \ |
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name, \
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bus, \
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s5p_serial##port##_init, \
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s5p_serial##port##_setbrg, \
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s5p_serial##port##_getc, \
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s5p_serial##port##_tstc, \
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s5p_serial##port##_putc, \
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s5p_serial##port##_puts, } |
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DECLARE_S5P_SERIAL_FUNCTIONS(0); |
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struct serial_device s5pc1xx_serial0_device = |
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INIT_S5P_SERIAL_STRUCTURE(0, "s5pser0", "S5PUART0"); |
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DECLARE_S5P_SERIAL_FUNCTIONS(1); |
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struct serial_device s5pc1xx_serial1_device = |
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INIT_S5P_SERIAL_STRUCTURE(1, "s5pser1", "S5PUART1"); |
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DECLARE_S5P_SERIAL_FUNCTIONS(2); |
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struct serial_device s5pc1xx_serial2_device = |
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INIT_S5P_SERIAL_STRUCTURE(2, "s5pser2", "S5PUART2"); |
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DECLARE_S5P_SERIAL_FUNCTIONS(3); |
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struct serial_device s5pc1xx_serial3_device = |
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INIT_S5P_SERIAL_STRUCTURE(3, "s5pser3", "S5PUART3"); |
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